Best planning resources/apps?

I’m just getting started to do some planning and budgeting for our wedding, and I wanted to know from you all what kind of resources, apps, websites, software, etc. is great for planning! I’m currently working with The Knot, and I’m fairly happy with it so far. Any other recommendations?

I like using the knot for their checklist. It’s fairly comprehensive. You can get an account, put in your wedding date, and they base your checklist on your timeline. You can add your own events as well. I have found that they suggest taking care of things early on instead of last minute which I love.